I have spread out My hands all the day to a rebellious people. walking in a way that is not good, after their own thoughts, sacrificing in gardens and burning incense upon bricks. Isa 65:2, 3.

'Burning incense upon bricks' stands for worship based on fabrications and falsities; and this is why these people are referred to as 'walking after their own thoughts'. In the same prophet,

On account of the pace and arrogance of heart of Ephraim, and of the inhabitants of Samaria, saying, The bricks have fallen but we will build from hewn stone. Isa 9:9, 10.

'Ephraim' stands for one who, having become intelligent, has then lapsed into wrong, who calls or makes falsities, or 'bricks', his truths. 'Hewn stone' stands for what is a fabrication. In Nahum,

Draw yourself water for the siege, strengthen your fortifications; go into the mud and tread the clay; renew the brick-kiln. There the fire will devour you. and the sword cut you off. Nahum 3:14, 15.

Here 'treading the clay' stands for falsities, 'renewing the brick-kiln' for worship based on them. 'Fire' is the punishment of evil desires, 'sword' the punishment of falsities. In Ezekiel,

Take a brick and lay it before you, and on it carve the city of Jerusalem. Ezek 4:1.

This text contains the command to besiege it, a prophecy implying that worship was falsified. The fact that 'brick' means falsity becomes clearer still from the meaning of 'stone' as truth, to be dealt with in what follows shortly.